Commit | Line | Data |
---|---|---|
16444a8a | 1 | # |
606576ce SR |
2 | # Architectures that offer an FUNCTION_TRACER implementation should |
3 | # select HAVE_FUNCTION_TRACER: | |
16444a8a | 4 | # |
2a3a4f66 | 5 | |
8d26487f TE |
6 | config USER_STACKTRACE_SUPPORT |
7 | bool | |
8 | ||
2a3a4f66 FW |
9 | config NOP_TRACER |
10 | bool | |
11 | ||
78d904b4 SR |
12 | config HAVE_FTRACE_NMI_ENTER |
13 | bool | |
14 | ||
606576ce | 15 | config HAVE_FUNCTION_TRACER |
16444a8a | 16 | bool |
bc0c38d1 | 17 | |
fb52607a | 18 | config HAVE_FUNCTION_GRAPH_TRACER |
15e6cb36 FW |
19 | bool |
20 | ||
60a7ecf4 SR |
21 | config HAVE_FUNCTION_TRACE_MCOUNT_TEST |
22 | bool | |
23 | help | |
24 | This gets selected when the arch tests the function_trace_stop | |
25 | variable at the mcount call site. Otherwise, this variable | |
26 | is tested by the called function. | |
27 | ||
677aa9f7 SR |
28 | config HAVE_DYNAMIC_FTRACE |
29 | bool | |
30 | ||
8da3821b SR |
31 | config HAVE_FTRACE_MCOUNT_RECORD |
32 | bool | |
33 | ||
1e9b51c2 MM |
34 | config HAVE_HW_BRANCH_TRACER |
35 | bool | |
36 | ||
ee08c6ec FW |
37 | config HAVE_FTRACE_SYSCALLS |
38 | bool | |
39 | ||
352ad25a SR |
40 | config TRACER_MAX_TRACE |
41 | bool | |
42 | ||
7a8e76a3 SR |
43 | config RING_BUFFER |
44 | bool | |
45 | ||
78d904b4 SR |
46 | config FTRACE_NMI_ENTER |
47 | bool | |
48 | depends on HAVE_FTRACE_NMI_ENTER | |
49 | default y | |
50 | ||
5f77a88b TZ |
51 | config EVENT_TRACING |
52 | bool | |
53 | ||
bc0c38d1 SR |
54 | config TRACING |
55 | bool | |
56 | select DEBUG_FS | |
7a8e76a3 | 57 | select RING_BUFFER |
c2c80529 | 58 | select STACKTRACE if STACKTRACE_SUPPORT |
5f87f112 | 59 | select TRACEPOINTS |
f3384b28 | 60 | select NOP_TRACER |
769b0441 | 61 | select BINARY_PRINTF |
5f77a88b | 62 | select EVENT_TRACING |
bc0c38d1 | 63 | |
40ada30f IM |
64 | # |
65 | # Minimum requirements an architecture has to meet for us to | |
66 | # be able to offer generic tracing facilities: | |
67 | # | |
68 | config TRACING_SUPPORT | |
69 | bool | |
45b95608 AV |
70 | # PPC32 has no irqflags tracing support, but it can use most of the |
71 | # tracers anyway, they were tested to build and work. Note that new | |
72 | # exceptions to this list aren't welcomed, better implement the | |
73 | # irqflags tracing for your architecture. | |
74 | depends on TRACE_IRQFLAGS_SUPPORT || PPC32 | |
40ada30f | 75 | depends on STACKTRACE_SUPPORT |
422d3c7a | 76 | default y |
40ada30f IM |
77 | |
78 | if TRACING_SUPPORT | |
79 | ||
4ed9f071 SR |
80 | menuconfig FTRACE |
81 | bool "Tracers" | |
82 | help | |
83 | Enable the kernel tracing infrastructure. | |
84 | ||
85 | if FTRACE | |
17d80fd0 | 86 | |
606576ce | 87 | config FUNCTION_TRACER |
1b29b018 | 88 | bool "Kernel Function Tracer" |
606576ce | 89 | depends on HAVE_FUNCTION_TRACER |
1b29b018 | 90 | select FRAME_POINTER |
4d7a077c | 91 | select KALLSYMS |
1b29b018 | 92 | select TRACING |
35e8e302 | 93 | select CONTEXT_SWITCH_TRACER |
1b29b018 SR |
94 | help |
95 | Enable the kernel to trace every kernel function. This is done | |
96 | by using a compiler feature to insert a small, 5-byte No-Operation | |
97 | instruction to the beginning of every kernel function, which NOP | |
98 | sequence is then dynamically patched into a tracer call when | |
99 | tracing is enabled by the administrator. If it's runtime disabled | |
100 | (the bootup default), then the overhead of the instructions is very | |
101 | small and not measurable even in micro-benchmarks. | |
35e8e302 | 102 | |
fb52607a FW |
103 | config FUNCTION_GRAPH_TRACER |
104 | bool "Kernel Function Graph Tracer" | |
105 | depends on HAVE_FUNCTION_GRAPH_TRACER | |
15e6cb36 | 106 | depends on FUNCTION_TRACER |
764f3b95 | 107 | default y |
15e6cb36 | 108 | help |
fb52607a FW |
109 | Enable the kernel to trace a function at both its return |
110 | and its entry. | |
692105b8 ML |
111 | Its first purpose is to trace the duration of functions and |
112 | draw a call graph for each thread with some information like | |
113 | the return value. This is done by setting the current return | |
114 | address on the current task structure into a stack of calls. | |
15e6cb36 | 115 | |
bac429f0 | 116 | |
81d68a96 SR |
117 | config IRQSOFF_TRACER |
118 | bool "Interrupts-off Latency Tracer" | |
119 | default n | |
120 | depends on TRACE_IRQFLAGS_SUPPORT | |
121 | depends on GENERIC_TIME | |
122 | select TRACE_IRQFLAGS | |
123 | select TRACING | |
124 | select TRACER_MAX_TRACE | |
125 | help | |
126 | This option measures the time spent in irqs-off critical | |
127 | sections, with microsecond accuracy. | |
128 | ||
129 | The default measurement method is a maximum search, which is | |
130 | disabled by default and can be runtime (re-)started | |
131 | via: | |
132 | ||
133 | echo 0 > /debugfs/tracing/tracing_max_latency | |
134 | ||
6cd8a4bb SR |
135 | (Note that kernel size and overhead increases with this option |
136 | enabled. This option and the preempt-off timing option can be | |
137 | used together or separately.) | |
138 | ||
139 | config PREEMPT_TRACER | |
140 | bool "Preemption-off Latency Tracer" | |
141 | default n | |
142 | depends on GENERIC_TIME | |
143 | depends on PREEMPT | |
144 | select TRACING | |
145 | select TRACER_MAX_TRACE | |
146 | help | |
147 | This option measures the time spent in preemption off critical | |
148 | sections, with microsecond accuracy. | |
149 | ||
150 | The default measurement method is a maximum search, which is | |
151 | disabled by default and can be runtime (re-)started | |
152 | via: | |
153 | ||
154 | echo 0 > /debugfs/tracing/tracing_max_latency | |
155 | ||
156 | (Note that kernel size and overhead increases with this option | |
157 | enabled. This option and the irqs-off timing option can be | |
158 | used together or separately.) | |
159 | ||
f06c3810 IM |
160 | config SYSPROF_TRACER |
161 | bool "Sysprof Tracer" | |
4d2df795 | 162 | depends on X86 |
f06c3810 | 163 | select TRACING |
b22f4858 | 164 | select CONTEXT_SWITCH_TRACER |
f06c3810 IM |
165 | help |
166 | This tracer provides the trace needed by the 'Sysprof' userspace | |
167 | tool. | |
168 | ||
352ad25a SR |
169 | config SCHED_TRACER |
170 | bool "Scheduling Latency Tracer" | |
352ad25a SR |
171 | select TRACING |
172 | select CONTEXT_SWITCH_TRACER | |
173 | select TRACER_MAX_TRACE | |
174 | help | |
175 | This tracer tracks the latency of the highest priority task | |
176 | to be scheduled in, starting from the point it has woken up. | |
177 | ||
35e8e302 SR |
178 | config CONTEXT_SWITCH_TRACER |
179 | bool "Trace process context switches" | |
35e8e302 SR |
180 | select TRACING |
181 | select MARKERS | |
182 | help | |
183 | This tracer gets called from the context switch and records | |
184 | all switching of tasks. | |
185 | ||
b77e38aa SR |
186 | config EVENT_TRACER |
187 | bool "Trace various events in the kernel" | |
b77e38aa SR |
188 | select TRACING |
189 | help | |
190 | This tracer hooks to various trace points in the kernel | |
191 | allowing the user to pick and choose which trace point they | |
192 | want to trace. | |
193 | ||
ee08c6ec FW |
194 | config FTRACE_SYSCALLS |
195 | bool "Trace syscalls" | |
196 | depends on HAVE_FTRACE_SYSCALLS | |
197 | select TRACING | |
0ea1c415 | 198 | select KALLSYMS |
ee08c6ec FW |
199 | help |
200 | Basic tracer to catch the syscall entry and exit events. | |
201 | ||
1f5c2abb FW |
202 | config BOOT_TRACER |
203 | bool "Trace boot initcalls" | |
1f5c2abb | 204 | select TRACING |
ea31e72d | 205 | select CONTEXT_SWITCH_TRACER |
1f5c2abb FW |
206 | help |
207 | This tracer helps developers to optimize boot times: it records | |
98d9c66a IM |
208 | the timings of the initcalls and traces key events and the identity |
209 | of tasks that can cause boot delays, such as context-switches. | |
210 | ||
211 | Its aim is to be parsed by the /scripts/bootgraph.pl tool to | |
212 | produce pretty graphics about boot inefficiencies, giving a visual | |
213 | representation of the delays during initcalls - but the raw | |
214 | /debug/tracing/trace text output is readable too. | |
215 | ||
79fb0768 SR |
216 | You must pass in ftrace=initcall to the kernel command line |
217 | to enable this on bootup. | |
1f5c2abb | 218 | |
2ed84eeb | 219 | config TRACE_BRANCH_PROFILING |
9ae5b879 | 220 | bool |
1f0d69a9 | 221 | select TRACING |
9ae5b879 SR |
222 | |
223 | choice | |
224 | prompt "Branch Profiling" | |
225 | default BRANCH_PROFILE_NONE | |
226 | help | |
227 | The branch profiling is a software profiler. It will add hooks | |
228 | into the C conditionals to test which path a branch takes. | |
229 | ||
230 | The likely/unlikely profiler only looks at the conditions that | |
231 | are annotated with a likely or unlikely macro. | |
232 | ||
233 | The "all branch" profiler will profile every if statement in the | |
234 | kernel. This profiler will also enable the likely/unlikely | |
235 | profiler as well. | |
236 | ||
237 | Either of the above profilers add a bit of overhead to the system. | |
238 | If unsure choose "No branch profiling". | |
239 | ||
240 | config BRANCH_PROFILE_NONE | |
241 | bool "No branch profiling" | |
242 | help | |
243 | No branch profiling. Branch profiling adds a bit of overhead. | |
244 | Only enable it if you want to analyse the branching behavior. | |
245 | Otherwise keep it disabled. | |
246 | ||
247 | config PROFILE_ANNOTATED_BRANCHES | |
248 | bool "Trace likely/unlikely profiler" | |
249 | select TRACE_BRANCH_PROFILING | |
1f0d69a9 SR |
250 | help |
251 | This tracer profiles all the the likely and unlikely macros | |
252 | in the kernel. It will display the results in: | |
253 | ||
45b79749 | 254 | /debugfs/tracing/profile_annotated_branch |
1f0d69a9 SR |
255 | |
256 | Note: this will add a significant overhead, only turn this | |
257 | on if you need to profile the system's use of these macros. | |
258 | ||
2bcd521a SR |
259 | config PROFILE_ALL_BRANCHES |
260 | bool "Profile all if conditionals" | |
9ae5b879 | 261 | select TRACE_BRANCH_PROFILING |
2bcd521a SR |
262 | help |
263 | This tracer profiles all branch conditions. Every if () | |
264 | taken in the kernel is recorded whether it hit or miss. | |
265 | The results will be displayed in: | |
266 | ||
267 | /debugfs/tracing/profile_branch | |
268 | ||
9ae5b879 SR |
269 | This option also enables the likely/unlikely profiler. |
270 | ||
2bcd521a SR |
271 | This configuration, when enabled, will impose a great overhead |
272 | on the system. This should only be enabled when the system | |
273 | is to be analyzed | |
9ae5b879 | 274 | endchoice |
2bcd521a | 275 | |
2ed84eeb | 276 | config TRACING_BRANCHES |
52f232cb SR |
277 | bool |
278 | help | |
279 | Selected by tracers that will trace the likely and unlikely | |
280 | conditions. This prevents the tracers themselves from being | |
281 | profiled. Profiling the tracing infrastructure can only happen | |
282 | when the likelys and unlikelys are not being traced. | |
283 | ||
2ed84eeb | 284 | config BRANCH_TRACER |
52f232cb | 285 | bool "Trace likely/unlikely instances" |
2ed84eeb SR |
286 | depends on TRACE_BRANCH_PROFILING |
287 | select TRACING_BRANCHES | |
52f232cb SR |
288 | help |
289 | This traces the events of likely and unlikely condition | |
290 | calls in the kernel. The difference between this and the | |
291 | "Trace likely/unlikely profiler" is that this is not a | |
292 | histogram of the callers, but actually places the calling | |
293 | events into a running trace buffer to see when and where the | |
294 | events happened, as well as their results. | |
295 | ||
296 | Say N if unsure. | |
297 | ||
f3f47a67 AV |
298 | config POWER_TRACER |
299 | bool "Trace power consumption behavior" | |
f3f47a67 AV |
300 | depends on X86 |
301 | select TRACING | |
302 | help | |
303 | This tracer helps developers to analyze and optimize the kernels | |
304 | power management decisions, specifically the C-state and P-state | |
305 | behavior. | |
306 | ||
307 | ||
e5a81b62 SR |
308 | config STACK_TRACER |
309 | bool "Trace max stack" | |
606576ce | 310 | depends on HAVE_FUNCTION_TRACER |
606576ce | 311 | select FUNCTION_TRACER |
e5a81b62 | 312 | select STACKTRACE |
4d7a077c | 313 | select KALLSYMS |
e5a81b62 | 314 | help |
4519d9e5 IM |
315 | This special tracer records the maximum stack footprint of the |
316 | kernel and displays it in debugfs/tracing/stack_trace. | |
317 | ||
318 | This tracer works by hooking into every function call that the | |
319 | kernel executes, and keeping a maximum stack depth value and | |
f38f1d2a SR |
320 | stack-trace saved. If this is configured with DYNAMIC_FTRACE |
321 | then it will not have any overhead while the stack tracer | |
322 | is disabled. | |
323 | ||
324 | To enable the stack tracer on bootup, pass in 'stacktrace' | |
325 | on the kernel command line. | |
326 | ||
327 | The stack tracer can also be enabled or disabled via the | |
328 | sysctl kernel.stack_tracer_enabled | |
4519d9e5 IM |
329 | |
330 | Say N if unsure. | |
e5a81b62 | 331 | |
a93751ca | 332 | config HW_BRANCH_TRACER |
1e9b51c2 | 333 | depends on HAVE_HW_BRANCH_TRACER |
a93751ca | 334 | bool "Trace hw branches" |
1e9b51c2 MM |
335 | select TRACING |
336 | help | |
337 | This tracer records all branches on the system in a circular | |
338 | buffer giving access to the last N branches for each cpu. | |
339 | ||
36994e58 FW |
340 | config KMEMTRACE |
341 | bool "Trace SLAB allocations" | |
342 | select TRACING | |
36994e58 FW |
343 | help |
344 | kmemtrace provides tracing for slab allocator functions, such as | |
345 | kmalloc, kfree, kmem_cache_alloc, kmem_cache_free etc.. Collected | |
346 | data is then fed to the userspace application in order to analyse | |
347 | allocation hotspots, internal fragmentation and so on, making it | |
348 | possible to see how well an allocator performs, as well as debug | |
349 | and profile kernel code. | |
350 | ||
351 | This requires an userspace application to use. See | |
4d1f4372 | 352 | Documentation/trace/kmemtrace.txt for more information. |
36994e58 FW |
353 | |
354 | Saying Y will make the kernel somewhat larger and slower. However, | |
355 | if you disable kmemtrace at run-time or boot-time, the performance | |
356 | impact is minimal (depending on the arch the kernel is built for). | |
357 | ||
358 | If unsure, say N. | |
359 | ||
e1d8aa9f FW |
360 | config WORKQUEUE_TRACER |
361 | bool "Trace workqueues" | |
362 | select TRACING | |
363 | help | |
364 | The workqueue tracer provides some statistical informations | |
365 | about each cpu workqueue thread such as the number of the | |
366 | works inserted and executed since their creation. It can help | |
367 | to evaluate the amount of work each of them have to perform. | |
368 | For example it can help a developer to decide whether he should | |
369 | choose a per cpu workqueue instead of a singlethreaded one. | |
370 | ||
2db270a8 FW |
371 | config BLK_DEV_IO_TRACE |
372 | bool "Support for tracing block io actions" | |
373 | depends on SYSFS | |
1dfba05d | 374 | depends on BLOCK |
2db270a8 FW |
375 | select RELAY |
376 | select DEBUG_FS | |
377 | select TRACEPOINTS | |
378 | select TRACING | |
379 | select STACKTRACE | |
380 | help | |
381 | Say Y here if you want to be able to trace the block layer actions | |
382 | on a given queue. Tracing allows you to see any traffic happening | |
383 | on a block device queue. For more information (and the userspace | |
384 | support tools needed), fetch the blktrace tools from: | |
385 | ||
386 | git://git.kernel.dk/blktrace.git | |
387 | ||
388 | Tracing also is possible using the ftrace interface, e.g.: | |
389 | ||
390 | echo 1 > /sys/block/sda/sda1/trace/enable | |
391 | echo blk > /sys/kernel/debug/tracing/current_tracer | |
392 | cat /sys/kernel/debug/tracing/trace_pipe | |
393 | ||
394 | If unsure, say N. | |
36994e58 | 395 | |
3d083395 SR |
396 | config DYNAMIC_FTRACE |
397 | bool "enable/disable ftrace tracepoints dynamically" | |
606576ce | 398 | depends on FUNCTION_TRACER |
677aa9f7 | 399 | depends on HAVE_DYNAMIC_FTRACE |
3d083395 SR |
400 | default y |
401 | help | |
402 | This option will modify all the calls to ftrace dynamically | |
403 | (will patch them out of the binary image and replaces them | |
404 | with a No-Op instruction) as they are called. A table is | |
405 | created to dynamically enable them again. | |
406 | ||
606576ce | 407 | This way a CONFIG_FUNCTION_TRACER kernel is slightly larger, but otherwise |
3d083395 SR |
408 | has native performance as long as no tracing is active. |
409 | ||
410 | The changes to the code are done by a kernel thread that | |
411 | wakes up once a second and checks to see if any ftrace calls | |
412 | were made. If so, it runs stop_machine (stops all CPUS) | |
413 | and modifies the code to jump over the call to ftrace. | |
60a11774 | 414 | |
bac429f0 SR |
415 | config FUNCTION_PROFILER |
416 | bool "Kernel function profiler" | |
493762fc | 417 | depends on FUNCTION_TRACER |
bac429f0 SR |
418 | default n |
419 | help | |
493762fc SR |
420 | This option enables the kernel function profiler. A file is created |
421 | in debugfs called function_profile_enabled which defaults to zero. | |
bac429f0 SR |
422 | When a 1 is echoed into this file profiling begins, and when a |
423 | zero is entered, profiling stops. A file in the trace_stats | |
424 | directory called functions, that show the list of functions that | |
425 | have been hit and their counters. | |
426 | ||
bac429f0 SR |
427 | If in doubt, say N |
428 | ||
8da3821b SR |
429 | config FTRACE_MCOUNT_RECORD |
430 | def_bool y | |
431 | depends on DYNAMIC_FTRACE | |
432 | depends on HAVE_FTRACE_MCOUNT_RECORD | |
433 | ||
60a11774 SR |
434 | config FTRACE_SELFTEST |
435 | bool | |
436 | ||
437 | config FTRACE_STARTUP_TEST | |
438 | bool "Perform a startup test on ftrace" | |
40ada30f | 439 | depends on TRACING |
60a11774 SR |
440 | select FTRACE_SELFTEST |
441 | help | |
442 | This option performs a series of startup tests on ftrace. On bootup | |
443 | a series of tests are made to verify that the tracer is | |
444 | functioning properly. It will do tests on all the configured | |
445 | tracers of ftrace. | |
17d80fd0 | 446 | |
fe6f90e5 PP |
447 | config MMIOTRACE |
448 | bool "Memory mapped IO tracing" | |
40ada30f | 449 | depends on HAVE_MMIOTRACE_SUPPORT && PCI |
fe6f90e5 PP |
450 | select TRACING |
451 | help | |
452 | Mmiotrace traces Memory Mapped I/O access and is meant for | |
453 | debugging and reverse engineering. It is called from the ioremap | |
454 | implementation and works via page faults. Tracing is disabled by | |
455 | default and can be enabled at run-time. | |
456 | ||
4d1f4372 | 457 | See Documentation/trace/mmiotrace.txt. |
fe6f90e5 PP |
458 | If you are not helping to develop drivers, say N. |
459 | ||
460 | config MMIOTRACE_TEST | |
461 | tristate "Test module for mmiotrace" | |
462 | depends on MMIOTRACE && m | |
463 | help | |
464 | This is a dumb module for testing mmiotrace. It is very dangerous | |
465 | as it will write garbage to IO memory starting at a given address. | |
466 | However, it should be safe to use on e.g. unused portion of VRAM. | |
467 | ||
468 | Say N, unless you absolutely know what you are doing. | |
469 | ||
4ed9f071 | 470 | endif # FTRACE |
40ada30f IM |
471 | |
472 | endif # TRACING_SUPPORT | |
473 |